<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<h1>登录</h1>
<hr>
<p th:text="${msg}" style="color: red;"></p>

<form th:action="@{/login}">
  <p>用户名：<input type="text" name="username"></p>
  <p>密码：<input type="text" name="password"></p>
  <p><input type="submit"></p>
</form>

</body>
</html>